Full-service, independent repair center -~ ARTISAN® with experienced engineers and technicians on staff. TECHNOLOGY GROUP ~I We buy your excess, underutilized, and idle equipment along with credit for buybacks and trade-ins. Custom engineering Your definitive source so your equipment works exactly as you specify. for quality pre-owned • Critical and expedited services • Leasing / Rentals/ Demos equipment. • In stock/ Ready-to-ship • !TAR-certified secure asset solutions Expert team I Trust guarantee I 100% satisfaction Artisan Technology Group (217) 352-9330 | [email protected] | artisantg.com All trademarks, brand names, and brands appearing herein are the property o f their respective owners. Find the Coherent Innova 90 at our website: Click HERE 0 COHERETI 1 Innova 90 Ion LASERS • Laser Products Division 3210 Porter Drive P.O. Box 10321 Palo Alto, CA (415) 493-2111 • • © Coherent Printed in U.S.A. 7/84 .5M r • TABLE OF CONTENTS Section 1.0 EQUIPMENT AND SPECIFICATIONS 1-1 1.1 Purpose 1-1 1.2 Description 1-1 1.2.1 Models 1-1 1.2.2 Laser Head 1-1 1.2.3 Plasma Tube 1-3 1.2.4 Control Electronics 1-3 1.2.5 Power Supply 1-6 1.3 Optional Accessories 1-6 1.3.1 Model 923 Etalon 1-6 1.3.2 Optional Optics 1-6 1.3.3 External Light/Current Regulation 1-7 1.3.4 Rack Mounting 1-7 1.3.5 Control Electronics/Computer Interface 1-7 Section 2.0 LASER SAFETY 2-1 2.1 Safety Instructions 2-1 2.2 BRH Compliance 2-3 Section 3.0 INSTALLATION 3-1 3.1 Utility Requirements 3-1 3.1.1 Electrical Requirements 3-1 3.1.2 Cooling Water Requirements 3-1 3.2 Unpacking 3-2 • 3.3 Primary Power Connection 3-2 3.4 Water Hose Coupling 3-3 3.5 Control Connections 3-5 3.5.1 Laser Head/Power Supply Interconnections 3-5 3.5.2 Remote Module Connector 3-5 3.5.3 External Interlock Connector 3-5 Section 4.0 CONTROLS AM OPERATIONS 4-1 4.1 Controls and Indicators 4-1 4.1.1 Control Module Controls and Indicators 4-1 4.1.2 Laser Head Controls 4-7 4.1.3 Power Supply Controls and Connectors 4-9 4.2 Operation 4-12 4.2.1 Turn-On Procedure 4-12 4.2.2 Maximizing Output Power 4-13 4.2.3 Synopsis of Light and Current Regulation 4-14 4.2.3.1 Light Regulation Mode 4-14 4.2.3.2 Current Regulation Mode 4-14 4.2.3.3 Power Range Selectors 4-14 4.2.3.4 Examples of Current and Light Regulation 4-14 4.2.4 Remote Control Operation 4-15 4.2.4.1 Remote Current Regulation 4-15 4.2.4.2 Remote Light Regulation 4-16 4.2.4.3 Mixed Mode Remote Regulation 4-16 4.2.4.4 Remote Standby Control 4-16 4.2.5 Wavelength Selection 4-17 4.2.5.1 Installation or Removal of Multiline Mirror Holder 4-17 4.2.5.2 Installation or Removal of Model 934 Wavelength Selector for Changes to and from Single Line Operation 4-19 4.2.6 Aperture Assembly 4-20 4.3 Installation of Model 923 Etalon Assembly 4-21 4.3.1 Single Frequency Operation on 514.5 nm (Argon) or 647.1 nm (Krypton) 4-21 4.3.2 Single Frequency Operation on Wavelengths Other Than 514.5 nm (Argon) or 647.1 nm (Krypton) 4-26 Section 5.0 THEORY OF OPERATION 5-1 5.1 The Noble Gas Ion Lasers 5-1 5.2 Plasma Tube 5-3 5.3 Resonator 5-4 5.3.1 Intracavity Optics 5-5 5.3.2 Wavelength Selector 5-5 5.3.3 Aperture 5-5 5.3.4 Etalon 5-5 5.3.5 Light Pick-Off 5-6 5.4 Power Supply 5-6 5.4.1 Rectifier-Filter 5-6 5.4.2 Passbank 5-6 5.4.3 Light and Current Regulator 5-7 5.4.4 Power Meter 5-7 5.4.5 Interlocks 5-8 5.4.6 Remote Control 5-8 5.4.7 Autofill 5-9 5.4.8 Starter 5-10 5.5 Model 923 Etalon Accessory 5-11 5.6 Basic Laser Concepts 5-11 5.6.1 Linewidths 5-11 5.6.1.1 Specification of Linewidths 5-12 5.6.1.2 Units of Measurements of Linewidths . 5-12 5.6.1.3 Factors Determining Laser Linewidth . 5-13 5.6.1.4 Importance of Linewidth 5-13 5.6.2 Cavity Modes 5-14 5.6.3 Etalons, Or Selecting A Single Frequency 5-15 5.6.3.1 Etalons as Frequency Filters 5-16 5.6.4 Jitter and Effective Linewidth 5-20 5.6.5 Transverse Mode 5-21 Section 6.0 OPTICS AND ALIGNMENT 6-1 6.1 Optical Cleaning 6-1 6.1.1 Multiline Mirror Cleaning 6-1 6.1.2 Output Coupler Cleaning 6-2 6.1.3 Beam Pick-Off Cleaning 6-3 6.1.4 Wavelength Selector Cleaning 6-4 6.1.5 Optional Model 923 Etalon Cleaning 6-5 6.1.6 Brewster Window Cleaning 6-6 ii 6.2 Changing Optics 6-7 6.2.1 Visible to Visible 6-8 6.2.2 Visible to UV Procedure 6-8 6.3 Mirror Alignment 6-9 6.3.1 Vertical Search Procedure 6-9 6.3.2 Coarse Mirror Alignment 6-10 6.3.3 Maximizing the Mirror Alignment 6-11 6.3.4 Aligning the Multiline Mirror Holder . 6-13 Section 7.0 TROUBLESHOOTING 7-1 7.1 Fault Indicators 7-1 7.2 Troubleshooting Guide 7-3 7.3 Utility Board Service Test Points 7-6 7.3.1 Tube Voltage 7-6 7.3.2 System Power Supply ±15 Vdc 7-6 Section 8.0 MAINTENANCE 8-1 8.1 Preventative Maintenance 8-1 8.1.1 Electrical Inspection 8-1 8.1.2 Optical Inspection and Cleaning 8-1 8.1.3 Water System Inspection and Cleaning 8-2 8.1.3.1 Water Hose Inspection 8-2 8.1.3.2 Water Filter Replacement 8-2 8.1.3.3 Water Flow Indicator Inspection and Cleaning 8-2 8.2 Corrective Maintenance 8-4 8.2.1 Fuses 8-4 8.2.1.1 Main Line Fuses 8-4 8.2.1.2 208 Volt System Fuses 8-4 8.2.2 Passbank Transistor Replacement 8-5 8.2.2.1 Passbank Functional Operation 8-5 8.2.2.2 Transistor Replacement Procedure 8-6 8.2.3 Tube Alignment Procedure 8-7 8.2.4 Aperture Alignment Procedure 8-8 Section 9.0 PARTS 9-1 9.1 Optics Selection Chart 9-1 9.2 Recommended Spare Parts 9-2 Section 10.0 SCHEMATICS Section 11.0 CUSTOMER SERVICE 11-1 11.1 Warranty 11-1 Returns and Adjustments 11-1 Water Cooled Products 11-2 Plasma Tube Warranty 11-2 11.2 Plasma Tube Returns and Exchanges 11-2 11.3 Service Information 11-3 11.4 Sales and Service Offices 11-4 INDEX I-1 • iii LIST OF ILLUSTRATIONS • Figure 1.1 Innova 90 Ion Laser, Outline Drawings 1-2 1.2 INNOVA 90 Series Ion Laser System with Remote Module 1-4 1.3 INNOVA 90 Series Ion Laser System with Control Module/Power Supply 1-5 3.1 Power Supply Power Cable Connections 3-3 3.2 Power Supply Rear Panel 3-4 4.1 Control Panel 4-1 4.2 INNOVA Head 4-7 4.3 Power Supply, Rear Panel and Passbank 4-9 4.4 Multiline Mirror Holder 4-18 4.5 Inserting Model 934 Wavelength Selector 4-19 4.6 Holder for Model 923 Etalon, with Dummy Etalon Installed 4-24 • 4.8 Etalon Tilt Adjustment Screws 4-24 4.7 Model 923 Etalon 4-25 4.9 Etalon Oven Temperature Adjustment Potentiometer 4-27 5.1 Energy Level Diagram Showing Major Laser Transitions in Argon II 5-2 5.2 Comparison of Linewidth of Laser and Incandescent Light 5-12 5.3 Laser Resonator 5-14 5.4 Transmission of Fabry - Perot Interferometer 5-14 5.5 Limiting the Multimode Bandwidth with an Etalon 5-15 iv 5.6 Optical Cavity Containing a Wavelength Selecting Brewster Prism and an Etalon • for Single Longitudinal Mode Operation The Etalon is tilted at a Small Angle from Normal Alignment 5-16 5.7 Beam Path Through an Etalon Showing Walk-off Loss of the Interfering Beams of an Etalon 5-17 5.8 Frequency Jitter 5-20 5.9 Multimode Laser Operation 5-21 5.10 Single - Mode Linewidth 5-21 5.11 Tranverse Laser Modes 5-21 6.1 Cleaning Optics Using the Drop Drag Method 6-2 6.2 Cleaning Using Hemostats and Tissue Pad . .. 6-3 6.3 Wavelength Selector 6-4 6.4 Disassembly of Model 923 Etalon for Cleaning 6-5 • 6.5 Brewster Window Cleaning 6-6 6.6 Vertical Search Procedure 6-10 6.7 Aligning Mirrors to the Bore 6-12 6.8 Multiline Mirror Holder, Top View 6-14 6.9 Multiline Mirror Holder, End View with Holder Installed 6-14 8.1 Passbank Drawer Showing Water Flow Indicator 8-3 8.2 Power Supply Rear Panel with Line Fuse Cover Removed 8-5 8.3 Current Regulator Board with TEST-RUN Switch 8-7 8.4 Aperture, Showing Allen Screws Used for Adjustment 8-9 LIST OF TABLES • Table 1.1 System Parameter Specifications 1-8 1.2 Performance Parameter Specifications 1-9 1.3 Dimensions 1-9 1.4 Output Power (IBMoo ) Specifications 1-10 4.1 Innova 90 Control Panel Controls and Indicators 4-2 4.2 Innova 90 Laser Head Controls and Indicators 4-8 4.3 Innova 90 Power Supply Controls and Connectors 4-10 4.4 Aperture Hole Sizes 4-20 7.2 Troubleshooting Guide Tabulation 7-3 9.1 Optics Selection Chart 9-1 9.2 Recommended Spare Parts Table 9-2 vi COHL=REFIT TESTED BY: LIGHT REGULATION STABILITY TEST SYSTEM TYPE 4/ -3- BEGINNING TUBE I -r:29- POWER SUPPLY NO.